Mark, there are several types that look good on a 40, but I think they’re all functionally marginal at best. I’ve tried F1 type mirrors (still have them) and now have spun aluminum Raydots (convex) installed. I like the looks of the Raydots, but the view rearward is limited.
Some owners seem to like the Vitaloni Californian mirrors, but I have no experience with them.
Also, I think the chrome bullet style mirrors are a nice looking option, but again, marginally functional. I have a new set that were delivered with my car, but I never installed them.